// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_
#define BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_

#include "base/base_export.h"
#include "base/threading/platform_thread.h"

namespace base {

namespace internal {

    struct ThreadPriorityToNiceValuePair {
        ThreadPriority priority;
        int nice_value;
    };
    // The elements must be listed in the order of increasing priority (lowest
    // priority first), that is, in the order of decreasing nice values (highest
    // nice value first).
    BASE_EXPORT extern const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4];

    // Returns the nice value matching |priority| based on the platform-specific
    // implementation of kThreadPriorityToNiceValueMap.
    int ThreadPriorityToNiceValue(ThreadPriority priority);

    // Returns the ThreadPrioirty matching |nice_value| based on the platform-
    // specific implementation of kThreadPriorityToNiceValueMap.
    BASE_EXPORT ThreadPriority NiceValueToThreadPriority(int nice_value);

    // Allows platform specific tweaks to the generic POSIX solution for
    // SetCurrentThreadPriority. Returns true if the platform-specific
    // implementation handled this |priority| change, false if the generic
    // implementation should instead proceed.
    bool SetCurrentThreadPriorityForPlatform(ThreadPriority priority);

    // Returns true if there is a platform-specific ThreadPriority set on the
    // current thread (and returns the actual ThreadPriority via |priority|).
    // Returns false otherwise, leaving |priority| untouched.
    bool GetCurrentThreadPriorityForPlatform(ThreadPriority* priority);

} // namespace internal

} // namespace base

#endif // BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_
